JSFiddle - React, Tailwind, and code Playground

by Dongor7

HTML

<div class="b">
  
</div>

CSS

.b {
  position: relative;
  border: 5px solid black;
  height: 60px;
  width: 60px;
  border-radius: 10px; 
  margin-left: 40px;
}

.b::after {
  position: absolute;
  content: '01';
  display: block;
  left: -10px;
  bottom: -10px;
  background-color: #fff;
  font-size: 45px;
}